The error code 50 indicates a paper jam condition. Whether there's actually still paper jammed or not, it's sensors are still indicating a jam. Check again for a bit of paper, or there may be a faulty sensor.
Check out this link: Brother for further information.
SOURCE: LCD displays Unable to print 50 for brother 540cn
The device has a mechanical problem.
Check the manual for more here.
SOURCE: After Paper jam Printer Flashing between unable
check again if theres something left in the area which the jam occurs then re start ur printer
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